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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let num1 = Number(prompt('请输入第一个数:'))
        let num2 = Number(prompt('请输入第二个数:'))
        let num3 = num1 + num2
        document.write('两数相加和为:'+num3)
    </script>
</body>
</html>